package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexPatterns;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import java.beans.beancontext.BeanContext;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public  class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.info("发送验证码成功，验证码为:{}",code);
        return Result.ok();
    }

    /**
     * 用户登录
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.校验验证码
        String Cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(Cachecode == null || !Cachecode.toString().equals(code)){
            return Result.fail("验证码错误");
        }
        //4.根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if(user == null){
            //6.不存在，创建新的用户并保存到数据库中
            user = createUserWithPhone(phone);
        }
        //7.保存用户信息到redis中
        //7.1.存在，随机生成token作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2将user对象转换为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) ->fieldValue.toString()));
        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    /**
     * 退出登录
     * @param request
     * @return
     */
    @Override
    public Result logout(HttpServletRequest request) {
        //1.获取用户昵称
        String nickName = UserHolder.getUser().getNickName();
        //2.获取当前时间
        LocalDateTime now = LocalDateTime.now();
        //3.获取请求头中的token
        String token = request.getHeader("authorization");
        //4.拼接tokenKey
        String tokenKey = LOGIN_USER_KEY + token;
        //5.删除redis中的token
        stringRedisTemplate.delete(tokenKey);
        log.info("用户：" + nickName + "成功退出登录！");
        return Result.ok();
    }

    /**
     * 签到
     * @return
     */
    @Override
    public Result sign() {
        //1.获取当前用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3.拼接key
        String key = "sign:" + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis，SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1,true);
        return Result.ok();
    }

    /**
     * 根据手机号创建用户
     * @param phone
     * @return
     */
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        return user;
    }
}
